Python Exception Handling

Python

try:
    x = int(input("Enter a number: "))
    print(100 / x)
except ValueError:
    print("That's not a number")
except ZeroDivisionError:
    print("Cannot divide by zero")
else:
    print("No error occurred")
finally:
    print("Done")

Enter a number: 0 Cannot divide by zero Done

Block	Runs when
try	Always (code that may fail)
except	A matching exception is raised
else	No exception occurred
finally	Always, even after return or an error

Raising Custom Exceptions

Python

class AgeError(Exception):
    pass

def vote(age):
    if age < 18:
        raise AgeError("Must be 18+")
    return "Eligible"

try:
    vote(16)
except AgeError as e:
    print("Error:", e)

Error: Must be 18+

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